Comment 1 for bug 1499607

[fedora@swarmbay5-dxjbycmlbxig-swarm-master-ehfcg6hpsq6q ~]$ sudo docker version
Client version: 1.7.1.fc21
Client API version: 1.19
Package Version (client): docker-io-1.7.1-2.git33de319.fc21.x86_64
Go version (client): go1.4.2
Git commit (client): 33de319/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1.fc21
Server API version: 1.19
Package Version (server): docker-io-1.7.1-2.git33de319.fc21.x86_64
Go version (server): go1.4.2
Git commit (server): 33de319/1.7.1
OS/Arch (server): linux/amd64

Google found that others have same issue with docker 1.7.1
https://forums.docker.com/t/cannot-manage-containers-are-you-trying-to-connect-to-a-tls-enabled-daemon-without-tls/2144